To clear up a few other myths....
Also there is much talk about the faint red visible glow coming from IR LED's. (Some more than others, due to design and other considerations.) While this is true, folks seem to think it's the beam itself, AGAIN not true at all.
What folks are actually seeing is ONLY the IR LED emitter itself INSIDE of the device and only within the 1-2deg cone. Basically one only see's this directly in front of the unit.
Vic